Interlayer Friction Parameters and Performance Impact of CRTS Ⅱ Slab Ballastless Track
In response to the interlayer interaction relationship of CRTSⅡ type slab ballastless track after separation,on-site operation line and indoor push plate tests were conducted to establish a mechanical characteristics analysis model.The influence of different interlayer friction parameters on the mechanical properties of the track structure with separation was studied.The research results show that under actual operation conditions,the track plate gradually debonds with the mortar layer as the jacking force increased.After complete debonding,sliding occurs.The horizontal displacement thrust of the track plate due to instability is between 160 kN and 200 kN.The horizontal thrust of the track plate due to stable sliding is between 210 kN and 250 kN,corresponding to a friction coefficient of 2.5～3.1.In the most unfavorable state of no bonding force between the track board and the mortar layer in the indoor test,the horizontal thrust for stable sliding of the track board is between 55 kN and 56 kN,and the corresponding friction coefficient is 0.79 to 0.80.As the interlayer friction coefficient increases,the deformation of the track structure improves,but the influence is limited.When the friction coefficient increases from 0.7 to 3.1,the maximum force on the wide and narrow joints decreases by 6.6％,and the maximum upward displacement of the steel rail and track plate decreases by 4.19％and 5.7％respectively.For CRTSⅡ slab ballastless track with already existing separations,the influence of interlayer friction state is relatively small.It is necessary to prevent and avoid interlayer separation diseases in advance to ensure good interlayer bonding.
high speed railwayCRTS Ⅱ slab ballastless trackfriction coefficientpush plate testinfluence law
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